<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>表格练习</title>
</head>
<body>
    <table border="1">
        <tr>
          <th>Header 1</th>
          <th>Header 2</th>
          <th>Header 3</th>
        </tr>
        <tr>
          <td rowspan="2">Rowspan Cell</td>
          <td>Data 1</td>
          <td>Data 2</td>
        </tr>
        <tr>
          <td>Data 3</td>
          <td>Data 4</td>
        </tr>
      </table>
      <table border="1">
        <tr>
          <th>Header 1</th>
          <th>Header 2</th>
          <th>Header 3</th>
        </tr>
        <tr>
          <td colspan="2">Colspan Cell</td>
          <td>Data 1</td>
        </tr>
        <tr>
          <td>Data 2</td>
          <td>Data 3</td>
          <td>Data 4</td>
        </tr>
      </table>
</body>
</html>